25 Jan
2017
25 Jan
'17
1:17 p.m.
I'll see what I can manage. Do you have a
datasheet for the latch
release scheme you're using?
i don't understand. you just flip the pin high for a few seconds like it does
in the code and it unlatches the door.
i guess you probably mean the motor controller shield, which is listed on line
12 of the code: https://www.arduino.cc/en/Main/ArduinoMotorShieldR3
but we won't be using that anymore, so the latch function will be very simple,
just flipping a pin to undo the latch.
the complicated part will be driving the three-phase permanent-magnet motor
that I just rigged up, which will be the front-door opener for the omni:
http://spaz.org/~jake/pix/omnidoormotor1.png
http://i.imgur.com/FUp1dvu.jpg
basically i will be controlling about 6 pins to drive that motor, and
monitoring 2 pins which will tell me quadrature of its position for that
purpose. and another output pin will control the latch.
this is a diagram of a similar motor, except it shows three hall-effect sensors
and i think our motor might only have two, is that possible? I need to look.
http://www.avdweb.nl/Article_files/Solarbike/Motor-controller/4-Pole-brushl…
this is the chip in the motor controller that I will be using, i worked on it
last night and am half-done wiring it up:
http://www.intersil.com/en/products/space-and-harsh-environment/harsh-envir…
there are three of those, to control two three-phase permanent-magnet motors,
because each motor needs three I-bridges. Since we only need one motor to move
the door, i'll just use one of the ones on the second side for the latch
solenoid.
here are pictures of what i was doing last night:
http://spaz.org/~jake/pix/2017-01/doormotor.html
all you need to do is get the RFID code that Henner wrote to compile in
arduino, and i can do the rest. what do you think of that?
i look forward to working with you on this, i think it will be more fun and
rewarding than some of the stuff we were doing before, since we'll actually be
getting the door to open and close from software. the other thing is that
there's more of a deadline on this project, since we're apparently able to get
in trouble for not being ADA compliant.
-jake
25 Jan
25 Jan
3:06 p.m.
New subject: Door hacking
2017-01-25 13:17 GMT-08:00 Jake <jake(a)spaz.org>rg>:
I see. That's what I would have assumed, except you said "all it does is
trigger
the latch release solenoid, but it's still using this super-fancy motor
control shield,"
which made it sound like the latch release solenoid was complicated enough
that
it needed to be driven by a fancy motor shield.
basically i will be controlling about 6 pins to drive that motor, and
This sounds like fun, and I'm interested in helping with it, including
working on
firmware for it.
This sounds like you're leaving me the boring part. I think it's silly to
port it to
arduino and I am not interested in working on this in the way you've
described.
How about we agree on a pinout for the 168P and I write the firmware while
you
work out the motor hardware, since you've already started on it?
Then we can get together at a later date, perhaps this coming Tuesday, and
see what we've got. We can reapportion labor as necessary.
Not sure why this private thread ended up on sudo-discuss, btw.
Alex
3:12 p.m.
New subject: Door hacking
On 01/25 15:06, Alexander Papazoglou wrote:
Not sure why this private thread ended up on
sudo-discuss, btw.
For what it's worth, from the perspective of someone who hasn't hacked
together anything quite like this, I've found the discussion quite
interesting.
Stephen
10:24 p.m.
New subject: Door hacking
we were using the motor shield originally because A. it was handy and B. it was
perfect for controlling the door-latching motor that was on the original doors,
especially since it has a current-sensing feature where it feeds the value of
current consumed to the analog inputs of the arduino. that was I was able to
have the software stop when the door latch reached its final position (and the
motor stalled and current went above the maximum threshold)
but then when we got the new door, it just had the latch and i just hooked it
up to the same wires and ripped most of the software out to just hit the latch.
ok, i'm just wiring up the hardware now and figuring out how it works, but you
can go ahead and start writing the motor program. i'm just not sure yet how
the hall-effect sensors from the motor are supposed to work, but i might figure
that out tonight i suppose.
well i think it's silly to keep everything in a complicated toolchain and
manage makefiles when i can use a simple IDE to shoot a program into the board
through the serial port, which i can do over ssh.. so i definitely want the
program to be able to be uploaded over serial.
How about we agree on a pinout for the 168P and I
write the firmware while
you work out the motor hardware, since you've already started on it?
the pinout can be whatever you want. I just need to keep probably two or three
of the PWM pins for the motor controlling.
Then we can get together at a later date, perhaps this
coming Tuesday, and
see what we've got. We can reapportion labor as necessary.
ok sounds good, i'll try to get the hardware done by then. i already have the
power supply connector finished and it might be ready to drive the motor by
tonight.
so i might make a "hello world" to try to turn the motor...
Not sure why this private thread ended up on
sudo-discuss, btw.
because i thought more people in the hackerspace should be aware of and
interested in what we're doing.
-jake
3037
days inactive
3038
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4 comments
3 participants
participants (3)
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Alexander Papazoglou -
Jake -
Stephen Whitmore